Tooth Sensitivity: Causes and Step-by-Step Treatment

What sensitivity is

Tooth sensitivity is brief sharp pain in response to cold, hot, sweet, or air. It usually comes from exposed dentin — the layer under enamel, which has microscopic tubules leading to the tooth's nerve.

The main causes

Gum recession

Dentin near the gumline becomes exposed as gums recede. Causes: aggressive brushing, gum disease, age, genetics.

Enamel wear

Grinding, acidic diet, or abrasive toothpastes thin the enamel and expose dentin.

Cracked tooth

Fine hairline cracks let fluids reach nerve endings.

Recent dental work

New fillings, crowns, or cleanings can cause temporary sensitivity for 1–3 weeks.

Decay

Cavities can present as sensitivity before pain.

Whitening

Temporary sensitivity from hydrogen peroxide is common, resolves in 1–3 days.

The treatment hierarchy

Level 1 — Home care (2–4 weeks)

• Sensitive toothpaste (Sensodyne, Colgate Sensitive Pro-Relief, Elmex Sensitive)
• Soft-bristle brush, gentle technique
• Fluoride rinse nightly
• Avoid very cold water and acidic drinks temporarily

Most mild sensitivity resolves within 2–4 weeks of consistent home care.

Level 2 — Professional in-office (if Level 1 fails)

• Fluoride varnish applied by the hygienist (sealing dentin tubules)
• Desensitising resin or glass ionomer applied to exposed dentin
• Laser desensitisation (Nd:YAG or Er:YAG laser seals tubules)

Cost: AED 200–600 per visit

Level 3 — Restorative (if specific tooth issue)

• Bonding to cover exposed roots
• Gum graft to re-cover receded areas
• Crown for extensively worn teeth
• Root canal if pulp is inflamed (sensitivity has become persistent toothache)

Level 4 — Treat the underlying cause

• Nightguard for grinders
• Periodontal treatment for gum disease
• Diet adjustment for acid erosion
• Fix cracked tooth if applicable

Products that work (and don't)

What works

• Fluoride and potassium nitrate toothpaste (gold standard)
• Pro-argin toothpaste (calcium-based tubule blocker)
• Stannous fluoride toothpaste
• Fluoride mouth rinses

What doesn't work (or works minimally)

• Whitening toothpastes (often abrasive)
• Charcoal toothpaste (abrasive, increases sensitivity)
• Oil pulling (not a replacement for fluoride)
• Most "natural" remedies

The brushing technique

Most gum recession in adults is from over-brushing with a hard brush.

• Soft or extra-soft bristles only
• Gentle, circular motions
• Electric brush on sensitive mode with a pressure sensor
• 2 minutes total, about 30 seconds per quadrant
• Spit — don't rinse — after brushing

The acid conversation

• Sparkling water daily: erodes enamel over years
• Lemon water: especially erosive, especially on waking
• Wine + tea + coffee: moderate acid load
• Kombucha, citrus, vinegar-based dressings: high acid

After any acid exposure, wait 30 minutes before brushing. Rinse with water in the meantime.

When to see a dentist

• Sensitivity in a single tooth that's persistent
• Sensitivity that doesn't improve with 3 weeks of Sensodyne
• Pain that lasts minutes, not seconds
• Pain that wakes you up at night
• Visible damage or a cavity

References

• American Dental Association — Sensitivity management
• Cochrane — Sensitive toothpaste meta-analysis